USGS Water-Year Summary for Site 11046050

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	Available Parameters
	00065 Gage height(Max.,Min.)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

11046050 Santa Margarita River at Mouth, near Oceanside, CA

LOCATION - Lat 33°14'16.1", long 117°23'43.1" referenced to North American Datum of 1983, in SE 1/4 NW 1/4 sec.10, T.11 S., R.5 W., San Diego County, CA, Hydrologic Unit 18070302, on Camp Pendleton, on right bank, 0.6 mi upstream from bridge on Northbound Interstate Highway 5, 1.3 mi upstream from mouth, and 3.5 mi northwest of Oceanside.

DRAINAGE AREA - 739 mi².

REVISIONS HISTORY - Nov. 2, 2018 to May 22, 2019: Unit value gage height data for this period have been revised superseding those published at http://waterdata.usgs.gov site 11046050.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1989 to October 20, 2010 (Record was suspended due to inaccessibility of gage), October 16, 2017 to current year, stage only. Unpublished records for water year 1989 available in files of the U.S. Geological Survey.

GAGE - Water-stage recorder. Datum of gage is 3.96 ft below NAVD of 1988. Prior to Oct. 16, 2017, at site 0.8 mi downstream at different datum.

EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 15.10 ft, from floodmarks and hydrographers' notes, Jan. 16, 1993, datum then in use; maximum gage height, 19.11ft, Feb. 14 2019; minimum recorded gage height, 1.66 ft, Feb. 09, 2005.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - October 1993 to October 20, 2010. DISSOLVED OXYGEN: October 1993 to Septmeber 30, 2010. pH: October 1993 to October 20, 2010. SPECIFIC CONDUCTANCE: October 1993 to October 20, 2010. WATER TEMPERATURE: October 1993 to October 20, 2010.

INSTRUMENTATION - Water-quality monitor from October 1993 - October 21, 2010.

REMARKS - Interruptions in record at times due to malfunction of recording equipment. Record was suspended on October 21, 2010 due to a Stop Work Order. Dissolved oxygen record was not used. pH records rated good. Specific conductance records rated good. Water temperature records rated excellent.

EXTREMES FOR PERIOD OF DAILY RECORD - DISSOLVED OXYGEN: Maximum recorded, >20.0 mg/L, several days in several years; minimum recorded, <0.20 mg/L, several days in several years. pH: Maximum recorded, 9.7 standard units, Apr. 28, May 1, 2, 2009; minimum recorded, 6.1 standard units, July 5, 2005. SPECIFIC CONDUCTANCE: Maximum recorded, 58,700 microsiemens, June 21, 2002; minimum recorded, 119 microsiemens, Feb. 24, 1998. WATER TEMPERATURE: Maximum recorded, 32.0°C, July 29, 1995, June 9, Aug. 14, 16, 1996; minimum recorded, 5.0°C, Nov. 21, 1994.